Oil burner



Oct. 17, 1933.

H. A. KUNITZ OIL BURNER Filed Nov. 13, 1931 2 Sheets-Sheet l INVENTOR.H4 N/V/BAL A. Ku/v/rz BY 2 M ATTORNEYS.

2 Sheets-Sheet 2 H. A. KUNITZ OIL BURNER Filed Nov. 13, 1931 J n ////7//n INVENTOR.

HA NN/BAL A. Ku/vT/Z BY @am 4% M A TTORNEYS.

Oct. 17, 1933.

Patented Oct. 17, 1933 OIL BURNER Hannibal A. Kunitz, Stratford, Conn,assignor to Gilbert 8: Barker Manufacturing Company, West Springfield,Mass., a corporation of Massachusetts Application November 13, 1931Serial No. 574,797

3 Claims. (Cl. 158-73) This invention relates to improvements in 011Fig. 6 is a fragmentary cross sectional view burners and, moreparticularly, to improved taken on the line6-6 of Fig. 3. means forprotecting the nozzle end of the Referring to these drawings: I haveshown, by burner from the intense heat radiating from the way ofillustrative example, one type of burner walls of the furnace, at timeswhen the burner in which my invention may be used to advantage. 60 isnot in use. The burner shown herein, is of the rotary, atom- Variousmeans have been heretofore proposed izing cup type. The invention,however, is capafor accomplishing the same general object but ble ofembodiment in burners of other types. such means depend on thewithdrawal of the The illustrated burner includes a barrel 10 1g nozzleend of the burner out of the furnace. A (Fig. 3) in the nature of acylindrical tube, one 05 movable mou o the burner is e s a y inend ofwhich is closed, as by a head 11 held in asmuch as the entire burner hasto be bodily place by screws 12. The other end of barrel 10 moved intoor out of firing position. is open and the barrel is mounted, as shownin S invention iS intended to c plish the Fig. 2, sothat the open endextends through S d Object Without requiring a ab an opening 0 in thewall w of the furnace into 70 m unt of t burner an dily v m t thefirebox 1. Such end of the barrel is preferoi the entire burner into andout f fi in D ably made with a removable and nozzle-forming 61011. The bWhich is fi in firing D portion 13 (Fig. 3). Air is admitted to theintion with its nozzle end inser ed in e furnace.v terior of barrel 10near the opposite end thereof,

is protected from the heat of the latter by means through a verticalpipe 14, formed integrally 75 of a sleeve which is telescoped over theburner ith d depending from th barrel, This pipe barrel and m y beProjected a Substantial 14 is adapted for connection to an air supplytance beyond the nozzle end thereof into the furpipe 1; (Fig, 2) leadingfrom 9, suitable source mice when t e burner is pp The Sleeve, of airunder pressure, as from a blower or air rather than the nozzle ornozzles of the burner, compressor The pipe 14 by t connection t issubjected to the direct flCtiOIl 0f the furnace pipe p, serves as a,support, for the burner heat and the nozzles are protected from the samew thi t nozzle 13 of th b l i t d by lyin within the sleeve at alocation spaced an atomizing cup 15 (Fig.3) having its inner end back aSubstanti d s from the p inner closed and its outer end open and havingan out- 30 end of the sleeve. wardly flaring circular wall. On the backof the The invention also has o a ject the p closed end of the cup is athreaded hub 16 which vision of means for automati ally l sin off tscrews into one end of the drum 17 of an air oil supply to the burner,whenever the sleeve is turbine, the blades of which are represented atProjected into its heat Protecting position. 18. This drum is rotatablysupported, as by ball 5 Other objects of the invention relates toprobearings 19, from a hollow spindle 20. This 90 V S dissipating e heatimparted to the spindle, at one end, is screwed into the hub of a sleeveand for cooling the same when in its spider 21,f1xedinbarrel 10. Air,passing through Projected and P ing position. barrel 10 and into airnozzle 13, is forced to turn O r Objects will i P as the detailed theblades 18 and rotate the cup 15. Such air,

scription proceeds. after leaving the turbine, emerges in an annular 95The invention will be disclosed with re erenc stream through the spacebetween the inner to the accomp y g drawings, in which: peripheral wallof the air nozzle 13 and the outer F g. 1 is an exterior sideelevational view of peripheral wall of the coil nozzle or cup 15. Oil isan oil burner embodying my invention; supplied to the inner periphery ofcup 15 by way Fig. 2 is a similar view, drawn to a slightly of alinedaxial passages 22 and 23 in the spindle 100 smaller scale, showing therelation of the burner 20 and hub 16, respectively, and emerges throughto the furnace and showing the protecting sleeve a. special pipe fitting24. Such oil drops onto the in projected position for protecting thenozzle flaring wall of the rapidly rotating cup 15 near end of theburner from the heat of the furnace; its inner end, and travelsoutwardly along such Fig. 3 is a sectional elevational view of the wall,being thrown centrifugally from the outer 105 burner; edge of the eup tomingle with the air stream Fig. 4 is a cross sectional view taken on thefrom nozzle 13 and form a hollow conical spray line -i4 of Fig. 3; inthe usual and well known way.

Fig. 5 is an end elevational view of the burner; The oil supply to theatomizing cup is controlled and by a needle valve 25, which cooperateswith the 0 inner end of the hollow spindle 20 to open or close theentrance end of passage 22. Oil is supplied to such passage by a pipe 26which connects the hub of spider 21 to an axial passage 27 in head 11.The joint between the pipe 26 and head is sealed by a stufiing box 28.The needle valve passes through pipe 26 and head ll and emerges from thelatter through a stuffing box 29. The needle valve is guided in pipe 26by two pins 30 which are disposed at right angles (see also Fig. 4) andpass diametrically through the valve stem with their projecting outerends slidably engaging the inner wall of pipe 26.

The oil supply is further controlled by a regulating valve 31 (Figs. 1and 5) of any suitable type. Oil is forced from any suitable source andby any suitable means to the lower end of valve 31 and passes from theupper end of the valve by way of a pipe 32 into a radial passage 33formed in head 11 and thence into the passage 27 to pipe 26.

The air supply may be regulated by a butterfly valve 34 (Figs. 3 and 5)mounted in the walls of pipe 14 and movable by a pair of levers 35, theupper ends of which frictionally engage between them a sector 36, fixedto barrel 10.

The burner, above described,- will serve as an example of one of manytypes with which my invention may be employed. The invention has to domore particularly with the protection of the nozzle end of the burnerfrom the heat of the furnace f at times when the burner is not in useand, obviously therefore, the invention is or may be largely independentof the described details of the burner mechanism.

The invention makes use of a sleeve 37 (Fig. 3) which normally (duringburner operation) is retracted as shown in Figs. 1 and 3. This sleeveencompasses the air nozzle 13 of barrel 10 and is slidable relativelythereto in the direction of the axis of the barrel. This sleeve can bemanually moved, when desired, to project beyond the nozzles 13 and 15,as shown in Fig. 2, in which position it protects these nozzles from theintense heat of thefurnace. The sleeve 37 has a long, integral, rearwardextension 38 of larger diameter by which it is slidably supported frombarrel 10. Preferably, such support is effected through radial fins 39,formed onv and extending longitudinally of the barrel. The inner surfaceof extension 38 slidably engage the outer edges of these fins. Thesupport of the sleeve is thus eifected with only a relatively smallamount of contact area with barrel 10 to minimize conduction of heatfrom the sleeve to the barrel. Between the fins are air channels whichenable air to be drawn into the furnace by the natural draft thereofthrough the space between the sleeve and barrel,for cooling purposes.The sleeve 37, it will be noted, is circumferentially spaced from nozzle13 so as to leave a passage for the cooling air. Preferably, the sleeveextension 38 is provided with radiating fins. These may be placed on theoutside of the barrel if necessary, but I prefer an internal series offins 40, which are similar to fins 39 but which preferably do not touchthe barrel 10. These fins 40 as well as fins 39 serve to radiate heatand aid in keeping the sleeve and barrel 10 as cool as possible. It willbe noted from Fig. 4 that there are two relatively short and closelyspaced fins 39 which receive between them one of the fins 40 in such away as to prevent turning of the sleeve on the barrel.

It is desirable that the flow of oil to cup 15 be positively andautomatically cut off whenever the protector sleeve is moved into theprojected position shown in Fig. 2. The valve 25 is provided for thispurpose and its operating mechanism is interrelated with the sleeve toaccomplish the above result. A valve operating lever 41, pivotallymounted at its lower end in a support 42 secured to head 12, is slidablyengaged at a point intermediate its ends with the outer end of the valverod 25 and is engaged on opposite sides by collars 43 thereon. The upperend of lever 41 is forked .and received between a pair of collars 44secured to a valve operating rod 45. This rod is slidably mounted inhead 11 and in a lug 46 which upstands from barrel 10. The rod 45extends beyond lug 46 and carries a coil spring 4'7 which acts betweenthe lug and a collar 48 on rod 45 with a tendency to force the rod tothe right and cause a closing of valve 25. When the protector sleeve 37is in retracted position, a lug 49 formed on the outer end of one of thefins 40 engages an end of rod 45 and holds the latter against movementby spring 47, thus holding valve 25 open. When the sleeve is projectedinto the position shown in Fig. 2, the lug 49 is carried away from rod45 and the spring 47 moves it to the right causing valve 25 to close.

In order to hold sleeve 37 in retracted position and to hold rod 45against movement by spring 47, alatch 50 of inverted U-shape in crosssection, is pivoted to lug 49 at one end and has its other end notchedto engage over lug 46, as clearly shown in Fig. 3. This latch has asuitable handle 51 fixed thereto. By lifting this handle, the latch isreleased from lug 46 and-the spring 47 released to close valve 25. Thehandle is then used as a means for moving sleeve 37 into projectedposition and subsequently back into the position shown in Fig. 3.

The normal operation of the burner is the same as in any ordinary burnerof the type disclosed. Oil is fed to the rotating cup 15 and throwncentrifugally from the rim thereof to be mixed with air flowing from theair nozzle 13. Additional air to support combustion enters the furnacethrough the opening 0 in the furnace wall and also through the channelsbetween the protector sleeve 37 and nozzle 13. When the burner isstopped, the operator lifts latch 50 by means of handle 51 and forcesthe sleeve 3'7 forwardly into the position shown in Fig. 2. This actreleases slide rod 45 and allows it to move to the right under the forceof spring 47 to close the oil valve 25, thus automatically cutting offthe fiow of oil to cup 15. When the burner is again to be started, it isnecessary to manually draw the protector sleeve back into retractedposition in order to open the oil valve 25 and admit fuel to cup 13.

The protectu sleeve receives much of the heat which would otherwise acton the oil cup. This sleeve is a good conductor of heat and conductsheat out of the furnace from the vicinity of the cup 15. Such hear israpidly dissipated because of the large exposed surface area of thesleeve and because of its radiating fins and because of the flow ofcooling air along both the outer and the inner surface of the sleeve.Thus, the sleeve shields the cup 15, as well as the air nozzle 13, fromthe damaging effects of the heat radiated from the furnace walls afterstoppage of the burner.

The invention has been disclosed herein, in an embodiment at presentpreferred, for illustrative purposes, but the scope of the invention isdefined by the appended claims rather than by the foregoing description.

What I claim is:

1. In combination, a burner barrel constituting a conductor for anatomizing medium and the outlet end of which is adapted to be exposed tothe heat of a furnace, a fuel conductor the outlet end of which ismounted in said end of the barrel, means for protecting said end andoutlets from the heat of the furnace when required, said meanscomprising a sleeve telescoped over the burner barrel for quick movementin the direction of the axis thereof from a normal retracted position inwhich the outlet end of the barrel is exposed to a position in which thesleeve projects a substantial distance beyond such end, said sleeveloosely encompassing said barrel leaving an annular passage between thesleeve and barrel which passage is open at one end to the atmosphere andat the other end to said furnace and through which passage a flow of airis induced for cooling purposes, and heat radiating fins within saidpassage and serving to space the sleeve from the barrel and to slidablysupport it therefrom.

2. In combination, a burner barrel constituting a conductor for anatomizing medium and the outlet end of which is adapted to be exposed tothe heat of a furnace, a fuel conductor the outlet end of which ismounted in said end of the barrel, means for protecting said end andoutlets from the heat of the furnace when required, said meanscomprising a sleeve telescoped over the burner barrel for quick movementin the direction of the axis thereof from a normal retracted position inwhich the outlet end of the barrel is exposed to a position in which thesleeve projects a substantial distance beyond such end, said sleeveloosely encompassing said barrel leaving an annular passage between thesleeve and barrel which passage is open at one end to the atmosphere andat the other end to said furnace and through which passage a flow of airis induced for cooling purposes, and a plurality of heat radiating finsin said passage some of which are connected to the sleeve and some tothe barrel.

3. In combination, a burner barrel constituting a conductor for anatomizing medium and the outlet end of which is adapted to be exposed tothe heat of a furnace, a fuel conductor the outlet end of which ismounted in said end of the barrel, means for protecting said end andoutlets from the heat of the furnace when required, said meanscomprising a sleeve telescoped over the burner barrel for quick movementin the direction of the axis thereof from a normal retracted position inwhich the outlet end of the barrel is exposed to a position in which thesleeve projects a substantial distance beyond said end, said sleeveloosely encompassing said barrel leaving an annular passage between thesleeve and barrel which passage is open at one end to the atinosphereand at the other end to said furnace and through which passage a flow ofair is induced for cooling purposes, and a plurality of heat radiatingfins in said passage some of which are connected to the sleeve and someto the barrel and some of which serve to space the sleeve from thebarrel and slidably support it therefrom.

HANNIBAL A. KUNITZ.

